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EPS lightweight fill, commonly called geofoam, is rigid closed-cell expanded polystyrene block manufactured to ASTM D6817 and used as an engineered alternative to soil fill. At roughly one percent of the weight of compacted earth, geofoam solves settlement and bearing problems on embankments, bridge approaches, and retaining walls without preloading, surcharging, or staged construction. EC Applications supplies and installs InsulFoam GF (EPS Geofoam) for highway, railway, airport, and civil projects across California, Texas, Nevada, and the western United States.
EPS geofoam is closed-cell expanded polystyrene molded into large rigid blocks and specified as a fill material under ASTM D6817, the Standard Specification for Rigid Cellular Polystyrene Geofoam. Design capacity comes from the block's compressive resistance at 1 percent strain, which ranges from about 2.2 psi for EPS12 up to 18.6 psi for EPS46. Because the material stays in its elastic range at working loads, engineers size the density class so sustained dead and live loads remain below that 1 percent strain value, which prevents long-term creep.
The defining property is weight. Geofoam densities run from roughly 0.7 to 2.85 pounds per cubic foot, compared to 110 to 120 pounds per cubic foot for compacted soil. That two-order-of-magnitude reduction is what lets designers place fill over soft or compressible soils, buried utilities, and existing structures that could never support conventional earthwork.
Geofoam weighs about one percent of what an equivalent volume of compacted soil weighs, so it adds almost no new load to the subgrade. On soft clays and compressible soils, that means the settlement that would normally require months of preloading, surcharging, and staged construction is engineered out of the project. Fill sections can be built to final grade immediately and paved without waiting for consolidation.
Geofoam itself does not settle. Blocks are manufactured to a specified density and compressive resistance, so the fill mass behaves predictably and uniformly, eliminating the differential settlement and structural inconsistencies that plague conventional embankments over poor ground. It also withstands freeze-thaw cycles, moisture, and road salts, so performance does not degrade seasonally the way moisture-sensitive soils can.
Geofoam is used anywhere the ground cannot carry the weight of conventional fill or where speed of construction matters. The most common civil applications are highway and road embankments over soft soils, bridge approach fills where the goal is to eliminate the settlement bump at the abutment, and railway and airport runway subgrades that demand tight tolerance on differential movement.
It is equally effective behind retaining walls and in berms, where replacing soil backfill with geofoam cuts lateral earth pressure on the wall to a fraction of the soil case, and as lightweight void fill over utilities, culverts, and buried structures. Ramps and grade transitions in constrained urban sites also use geofoam because blocks can be stacked and trimmed to geometry that would be difficult to build and compact in soil.
EC Applications installs InsulFoam GF on these applications throughout California, Texas, and Nevada, working from offices in Anaheim, Midland, and Sparks.
Blocks are placed by hand or with light equipment on a prepared, leveled bedding layer, typically sand or fine granular material. Because a full-size block weighs so little, no heavy compaction or earthmoving equipment is needed, which keeps installation fast and safe on congested or low-access sites. Blocks are laid in running-bond courses with staggered joints, and layers are typically interlocked with barbed mechanical connector plates to resist shifting during construction.
Field trimming is done with hot-wire cutters or saws, so blocks fit tightly around utilities, structures, and grade breaks. Geofoam is then protected from sunlight, hydrocarbons, and concentrated loads by the overlying system: commonly a reinforced concrete load distribution slab or a geomembrane separation layer, followed by pavement section or soil cover. Where fuel spill exposure is a design concern, a geomembrane barrier over the fill is standard practice, and EC Applications self-performs that lining work.
EC Applications is a licensed contractor (California CSLB #894068 and #1003207) that supplies and installs InsulFoam GF as one trade within a broader geosynthetics scope. Because our crews also install geomembranes, methane barriers, and containment systems, we can deliver the geofoam mass plus its separation and protection layers under one contract instead of splitting the scope across multiple subcontractors.
InsulFoam GF is manufactured to meet job specifications, with multiple density classes and block sizes available, and it meets or exceeds ASTM D6817. The material is 100 percent recyclable and contains no HCFCs or formaldehyde. Whether it is a new project or a remodel, ECA will help you find a solution to meet your needs.
Installation quality is verified against the project specification using the applicable ASTM and GRI test methods, with documented QA records at handoff.
| Type | Density (pcf) | Compressive resistance at 1% strain (psi) |
|---|---|---|
| EPS12 | 0.70 | 2.2 |
| EPS15 | 0.90 | 3.6 |
| EPS19 | 1.15 | 5.8 |
| EPS22 | 1.35 | 7.3 |
| EPS29 | 1.80 | 10.9 |
| EPS39 | 2.40 | 15.0 |
| EPS46 | 2.85 | 18.6 |
Confirm the specified ASTM D6817 density class, block layout, and protection system against project loads and geometry, and coordinate InsulFoam GF block sizes with the manufacturer.
Prepare and level the subgrade, then place the sand or fine granular bedding layer that the first course of blocks bears on.
Place blocks by hand in running-bond courses with staggered joints, installing barbed connector plates between layers to lock the mass together.
Hot-wire cut or saw blocks in the field to fit around utilities, structures, drainage, and grade breaks.
Install the separation geomembrane, load distribution slab, or soil cover that shields the geofoam from UV, hydrocarbons, and concentrated loads.
Verify finished grades and connections, then turn the fill section over for paving or surface construction.
Our crews handle engineering, fabrication, field installation, and maintenance. Tell us about your site and we will scope it with you.